The top 10 percent of earners took more than half of the country's total income in 2012, the highest level recorded since the government began collecting the relevant data a century ago, according to an updated study by the prominent economists Emmanuel Saez and Thomas Piketty.

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The figures underscore that even after the recession the country remains in a new Gilded Age, with income as concentrated as it was in the years that preceded the Depression of the 1930s, if not more so.

High stock prices, rising home values and surging corporate profits have buoyed the recovery-era incomes of the most affluent Americans, with the incomes of the rest still weighed down by high unemployment and stagnant wages for many blue- and white-collar workers.